Abgesehen davon, dass die Widerrufsfrist morgen endet, gilt der Widerruf heute.

It means something like apart from the fact that or setting aside the fact that.

So the sentence structure is:

• Abgesehen davon, dass ... = apart from the fact that ...
• main statement follows after that

It is a fairly formal way to introduce an additional point or to set one fact aside while stating another.

This is a fixed German pattern.

• abgesehen von normally means apart from or except for
• davon is the pronominal form of von dem / von etwas
• when the thing being referred to is a whole clause, German often uses davon, dass ...

So:

• abgesehen von dem Punkt = apart from that point
• abgesehen davon, dass ... = apart from the fact that ...

You should learn Abgesehen davon, dass ... as a set phrase.

Because dass introduces a subordinate clause, and in German subordinate clauses the finite verb usually goes to the end.

So:

• die Widerrufsfrist endet morgen = the withdrawal period ends tomorrow
  
  • normal main clause word order
• ..., dass die Widerrufsfrist morgen endet = ..., that the withdrawal period ends tomorrow
  
  • subordinate clause, so endet moves to the end

This is one of the most important German word-order rules.

Because German main clauses follow the verb-second rule.

The first position is taken by the whole introductory element:

• Abgesehen davon, dass die Widerrufsfrist morgen endet

After that, the finite verb must come second:

• gilt

Then comes the subject:

• der Widerruf

Then the rest:

• heute

So the structure is:

1. introductory phrase/clause
2. finite verb
3. subject
4. other elements

If the sentence stood alone without the introductory phrase, it would be:

• Der Widerruf gilt heute.

Literally, gelten can mean to be valid, to apply, to count, or to be considered.

In this legal-style sentence, gilt der Widerruf heute means something like:

• the withdrawal/revocation is valid today
• the withdrawal takes effect today
• the withdrawal applies today

So this is not everyday counting in the mathematical sense. It is the legal/validity meaning of gelten.

They are related, but not the same thing.

• der Widerruf = the withdrawal, cancellation, or revocation itself
• die Widerrufsfrist = the time limit for making that withdrawal

So:

• Widerruf = the action or declaration
• Widerrufsfrist = the deadline period for that action

Also notice the compound noun:

• Widerrufsfrist = Widerruf
  • -s-
    • Frist

That -s- is a common linking element in German compounds.

Both are in the nominative case, because each is the subject of its own clause.

• die Widerrufsfrist morgen endet
  Here, die Widerrufsfrist is the subject of endet.
• gilt der Widerruf heute
  Here, der Widerruf is the subject of gilt.

The unusual-looking part is only the word order, not the case.

German uses commas to mark subordinate clauses very consistently.

In this sentence:

• Abgesehen davon, dass die Widerrufsfrist morgen endet, gilt der Widerruf heute.

the clause beginning with dass is a subordinate clause, so it is set off with commas.

You can think of it like this:

• introductory expression + subordinate clause,
• then the main clause

German punctuation is generally stricter than English punctuation in this area.

Yes, it could appear elsewhere, but the placement changes the emphasis slightly.

Current version:

• ... gilt der Widerruf heute.
  This is natural and puts heute in a normal final position.

Other possible versions:

• ... gilt heute der Widerruf.
  Also possible, but it sounds a bit more marked or stylistically shaped.
• Der Widerruf gilt heute.
  Neutral standalone sentence.

German allows some flexibility, but word order often affects emphasis, rhythm, and style rather than basic meaning.

Yes, very much so.

Words like:

• Widerruf
• Widerrufsfrist
• gilt

make it sound legal, administrative, or contractual.

In everyday speech, people might use simpler wording, depending on the context. But for legal notices, contracts, consumer rights, or official communication, this style is normal.

Not exactly.

• obwohl means although / even though
• abgesehen davon, dass means apart from the fact that / setting aside the fact that

They can sometimes feel similar in context, but the logic is different:

• obwohl introduces a contrast
• abgesehen davon, dass introduces something being set aside or treated as an additional point

So this sentence is not really saying although the withdrawal period ends tomorrow. It is more like apart from the fact that the withdrawal period ends tomorrow, the withdrawal is valid today.

Sometimes yes, depending on context.

Possible translations include:

• withdrawal
• revocation
• cancellation

But in legal German, Widerruf often has a specific technical meaning: formally withdrawing a declaration or exercising a right to withdraw. So in many contexts, withdrawal or revocation is more precise than the more general word cancellation.

The best translation depends on what kind of legal action is being described.